I assume he has moved out teanytrace. Either way, you need to inform your lender that you are likely to experience problems with your repayments - and before payments are missed.
Also, you may wish to consider renting out a spare room, if you have one. You are able to receive rental income of up to approx �4200 per annum without paying tax on it, which may help.
Your husband may wish to help keep the property from being sold below value, or possibly repossessed (which often leads to the same thing). Suggest to him that you work together to keep the house, and when the housing situation is better you can hopefully sell at market price to your mutual benefit.
Otherwise, you will have to sell, probably at some loss in the current housing climate.